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php正则表达式匹配title的代码如下：
$file = "
百度知道——提问问题";
preg_match_all('/
(.*)<\/title>/i',$file,$content); </p>
<p>echo '<pre>';</p>
<p>print_r($content);</p>
<p>结果：</p>
<p><img loading="lazy" class="ikqb_img" src="/picurl?url=https%3A%2F%2Fiknow-pic.cdn.bcebos.com%2Fb64543a98226cffc743c05d4be014a90f603ea46%3Fx-bce-process%3Dimage%252Fresize%252Cm_lfit%252Cw_600%252Ch_800%252Climit_1%252Fquality%252Cq_85%252Fformat%252Cf_auto" esrc="https://iknow-pic.cdn.bcebos.com/b64543a98226cffc743c05d4be014a90f603ea46"></p></p>
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<div class="wdhuidaxm">网友（2）：</div>
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<p><?php<br>$s = '<a title="abc.jpg" href="fefefe"><br> <img src="xsdsd.jpg" alt=\'xxsd.jpg\' title="eeerrfff" /><br> </a><br> <img src="xsdsd.jpg" alt="eeerrfff.pngxxsd" title="xxsd.jpg" />';<br>$pat = '/(<img.*?)((alt|title)=[\'"]+[^\'|"]*\.(jpg|gif|png|bmp)[\'"]+)/';<br>echo preg_replace($pat , '$1' , $s);<p><br></p> <p><br></p> <p></p></p>
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<div class="wdhuidaxm">网友（3）：</div>
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<p><p>$file = "<title>百度知道——提问问题";
preg_match_all('/
(.*)<\/title>/i',$file,$content); </p>
<p>echo '<pre>';</p>
<p>print_r($content);</p>
<p>结果：</p>
<p><img loading="lazy" class="ikqb_img" src="/picurl?url=https%3A%2F%2Fiknow-pic.cdn.bcebos.com%2F5ab5c9ea15ce36d3deabff853ff33a87e850b1d3%3Fx-bce-process%3Dimage%252Fresize%252Cm_lfit%252Cw_600%252Ch_800%252Climit_1%252Fquality%252Cq_85%252Fformat%252Cf_auto" esrc="https://iknow-pic.cdn.bcebos.com/5ab5c9ea15ce36d3deabff853ff33a87e850b1d3"></p></p>
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